My son just told me he was raped by a priest at my church. What should I do? ?

Does it not pop into your head to call the police. Get your son to a doctor. Get him counseling asap? 

Which one will you choke?

The priest will probably get away with it so probably best to choke the bastard out. Though you won´t get away with that.

So it´s a choice. Seconds of revenge for some years in jail. Or let the bastard get away with it and probably continue doing the same to others.

Local police.. Evidence. Lawyer.call the cops

call the cops / FBI 

why , your son is not longer a virgin is he , and think of the money you would make sueing the church , shame they get there money from the poor ..whats the old church saying , bless you son , i want your bum ..amen ..or is it ahh boys in long alter dress .thank you lord ..just kneel down before you pray and you will see the light .

The answer to this question is a frkn No Brainer

Call the Cops!

And

DON'T take "we looked into it & can't do anything" for an answer!

And

For Christ's sake Get a frkn Attorney & SUE

And

Tell the church where to go & what to do with itself 

And

take your worship elsewhere and as many parishioners as will listen with you. 

if my son was raped I, too, would go on yahoo answers to seek the advice from strangers

Your son is not alone, there are networks for survivors of sexual abuse by religious orders. Sadly, it is not uncommon

https://www.snapnetwork.org/

talk to the police about it